Pulp product and its manufacture



Oct. 25, 1932. D. M. SUTHERLAND, JR ,3

PULP PRODUCT AND ITS MANUFACTURE Filed March 29, 1929 INVENTOR Patented Oct. 25, 1932 I UNITED STATES PATENT OFFICE DANIEL MAN SON SUTHERLANI), .13., OF MOBRISVILLE, PENNSYLVANIA PULP PRODUCT AND ITS MANUFACTURE Application filed Iarch 29, 1929. Serial No. 350,872.

My invention relates to pulp products such Fig. V is a fragmentary side view of a pulp as boards, sheets, slabs, and the like, and to sheet. the technique and apparatus for their manu- Figs. I and II show a drier plate 10 adapted facture. It is particularlyapplicable' to in to cooperate with similar plates in a stack, as

sulative board, etc.,ofrelativelycoarsewoody described above. Adjacent one edge, it has 55 fibre, as well as to fine fibre board and the spacing strips 11, 11 on its upper and lower like. As regards the board itself, my invensides, secured by screws 12 at suitable intertion is concerned with the provision of a survals. The spacers 11, 1,1 serve (in conjuncface roughened with projections adapted t1on,usually, with similar spacers on adjacent in to hold plaster or the like, when the board 1s drier plates) to determine the thickness of 00 used as wall-board, As regards the manuthe pulp boards that the plate participates f at f th h d, my i ti i n- 1n forming. As indicated in Figs. I and II, cerned with the production of the roughened he plate 10 is provided with a multiplicity surface, and with providing for the escape of 9 h atlng el ments 13 (to be described here- 15 th vapor th t i f d h th l i inafter) that heat it to a suitable tempera- 65 hot-pressed. As regards the apparatus emtllre f r dry1ng the pulp sheets. As shown ployed, th in ntion i l concerned with rather diagrammatically in Fig. II, the plate the arrangements and construction thereof 10 has a multiplicity of channels 14 formed fo h ti therein for the escape of the vapor generated co In the manufacture of pulp board, aqueous y the h 1 70 pulp of suitably divided wood or other fibre As shown In g III nd IV, the vent is brought i t h t f i an apparatus channels 14 of the plate 10-have the character known as a t hi d i ft d of grooves 1n its lower active surface. These pressed and dried between heated surfaces, to g e 14 are of V'seetieh, with a Slight consolidate it and free it of moisture, in an p g head at the m, and With apparatus known as a drier. Sometimes, p g sides Preferably at an acute the sheet of wet, loose pulp as first formed is g r' y less- In Practice, y may given a li i ld pressing, so as t be about 1n. wlde or a little less, somewhat squeeze out as much water as possible before {here than T36 p, and Sp about /2 it go s t th d i d th reduce th 1n. on centers. As shown in Flg. IV, there are so amount to be vaporized, two intersecting sets of grooves, 14, extending Oneform of drier heretofore used is illusp with the edges of the Plate 10 and tr t d i my P t t N 1,50 7 I have substantially at right angles to one another. also used a type of drier comprising a stack The eeepemtlhg upper surface of the l of heated plates between. each pair of which a cent Plate 10 need not heeessenly h g V S5 sheet may be pressed; and I have hereinafter but on the Contrary he P 1 as here explained the invention as embodied in plates d a ii p z l ig d er e spacing s rips w11c a aptable to thls type of apparatus form the edges of the mold cavlty between.

In the drawing, Fig. I is a top view of a Portion of plate element or member used wlizfi i iib re sheet S is placed between ad- 90 h gP i ie the jacent heated plates 10, 10 and the latter are h j s %erresp0hd1hg edge m pressed together to the limit permitted by t h their spacing means 11, the sheet S is com- 1S a fragmehtal'X see-hone! VleW pressed and its material partially fills the of a P of Plate elements wlth P p sheet grooves 14, as indicated in Fig. III. How- Ph between them, 3 larger Scale than ever, as the embossed ridges of material S F1gs .I and II. only partially fill the grooves 14,say to F 1g. IV 1s a bottom view of the upper pla about half the de th of the grooves, the shown 1n F1gs.II and III. channels formed by the angles of,.these grooves 14 always remain open, so as to colform a network of intersecting embossed lect the vaporized moisture from the sheet S and permit it to escape. If the mold formed by the plates 10, were not thus vented, the

vapor would remain occluded under pressure in the sheet and disrupt it when the mold was subsequently opened.

The net-work of embossed ridges R left on the sheet, S as shown in Fig. V, serves as a roughening to facilitate the application of plaster, as well as to hold the plaster: i. e., the ridges R help to scrape the plaster ofi' the plasterers tool as the tool is moved over the board.

The drier plate 10 may be electrically heated, by means of heating units such as coils 13 in parallel chambers or bores 16 in the thickness of the plate (Figs. I and 11). As here shown, the plate-1O is divided at its middle plane into similar halves 17, 18 provided with reciprocally corresponding half-round grooves that cooperate (when the halves. are put together) to form the bores 16 for the heating units'13. The halves 17, 18 may be secured together by a number of fasteners such as bolts or rivets 19 located between the units 13, and suitably spaced apart.

Having thus described my invention, I claim:

1. A drier for pulp sheets comprisin opposed members between which the pulp s eets are hot-pressed, one of said members having a multiplicity of V-grooves in its active surface, affording vent channels therein in their angles for the escape of vapor beyond the depth to which the grooves'are filled by the pulp.

' 2. A drier for pulp sheets comprising opposed members between which the pulp sheets are hot-pressed, one of said members having in its active surface two sets of intersecting V-grooves extending substantially at right angles, and affording vent channels therein for the escape of vapor beyond the depth to which the grooves are filled by the pulp.

3. A drier member for pulp sheets com-' prising a pair of superposed plates provided with grooves in their juxtaposed faces and secured together with their grooves in registry, and electrical heating coils in the bores formed by the grooves.

.4. A drier member for pulp sheets comprising a pair of superposed plates with registering grooves in their juxtaposed faces, electrical heating coils in the bores formed by the grooves, and rivets through the plates between their said bores securing the plates together.

5. A drier member for cooperating with a similar member in hot-pressing a pulp sheet, comprising a plate having electrical heating elements in separate bores provided in its thickness, and having in its outer face a multiplicity of intersecting grooves affording vents for the escape of vapor and adapted to 

